Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.

The power of converging lens.

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The focal length of a converging lens.

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The power of a diverging lens.

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The focal length of a diverging lens.

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Solution

The correct options are
B The focal length of a converging lens.
D The focal length of a diverging lens.
We have focal length,
$f \propto λ$ , where $λ$ is the wavelength.
Hence the focal length of a converging and diverging lens increases with increase in wavelength.

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Which of the following quantities increase when wavelength is increased? Consider only the magnitudes.

The correct options are B The focal length of a converging lens. D The focal length of a diverging lens.We have focal length,f∝λ, where λ is the wavelength.Hence the focal length of a converging and diverging lens increases with increase in wavelength.

The correct options are
B The focal length of a converging lens.
D The focal length of a diverging lens.
We have focal length,
$f \propto λ$ , where $λ$ is the wavelength.
Hence the focal length of a converging and diverging lens increases with increase in wavelength.